*continued from your post
For instance, the Display entry for astral construct power is Visual; see text" The text indicates that a construct is formed. The construct, as a visible object, is the visible display for the astral construct power.
Couldn't you still shut off the visual display of the ectoplasm construct?
i dont think so, since displays are specifically just ways your body shows the fact that you're manifesting a power. it does imply that the construct is the visual part of the power, by saying see text, but it is kinda shaky. personally, i'd probably just let them have a psionic equivalent of invisible spell, and let them use that.